SAAF Help anyone?

I collect/research the Commonwealth Air Forces of WW2, mainly Canada, Gt Britain, Australia, New Zealand, Rhodesia, India and South Africa. I have yet to find any good reference on badges and insignia of the SAAF during WW2.

Can anyone help with reference books, or leads on SSAF insignia?

Surely they must have had ground trade badges for Chaplains, mechanics, photographers, etc?